BMW 3 Series E90 320si N45 Petrol Engine Wiring Loom Harness 7564408

The BMW 3 Series E90 320si Petrol Engine Wiring Harness is an original installation component designed for precise connection of the N45 unit's accessories. Thanks to BMW's factory design, the harness ensures stable signal transmission and power supply between sensors, the control unit, and engine components, which translates to correct powertrain operation.

Specifications and technical data

• SKU: rhd-7564408
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7564402 7564408
• Substitutable numbers: 12517564402, 7564402, 12517564408, 7564408, 12517561074, 7561074, 12517561069, 7561069
• Fuel type: Petrol
• Category: Wiring Harnesses, Cables & Connectors

Application and Compatibility

The presented BMW 3 Series E90 320si N45 Engine Wiring Harness has been specifically designed for the petrol unit, guaranteeing compatibility with the operating characteristics of this engine type. Appropriately routed wires and dedicated connectors allow for correct connection of elements such as sensors, injectors, and control components, without the need for installation modifications.

By maintaining the original wire routing geometry, the harness allows for the preservation of the factory layout in the engine bay, facilitating servicing, diagnostics, and subsequent maintenance work.

Construction and Technical Function

This component belongs to the Wires, Harnesses, and Connectors category, meaning it is responsible for the physical electrical connection between key engine components. The construction includes:

• a set of wires with appropriately selected cross-sections for power and signal circuits,
• factory connectors matched to the N45 engine accessories,
• mounting point placement consistent with the original layout in the BMW 3 Series E90 320si.

This configuration promotes proper resistance to vibrations, temperature, and conditions within the petrol engine bay, and also minimizes the risk of chafing and signal interference.

Condition, Benefits of Installation, and Service Aspects

The harness comes from the group of used OEM BMW parts, allowing for the preservation of the vehicle's original specification while reducing costs compared to new components. Using the factory installation instead of universal solutions eliminates problems with connector fitment, wire length, and compatibility with the control electronics.

Replacing a damaged or corroded harness with a functional OEM part is particularly important in cases of symptoms such as unstable engine operation, sensor errors, or intermittent starting problems. A correctly selected harness for the N45 petrol engine helps restore the correct operating parameters of the powertrain and facilitates further computer diagnostics.

Why Choose an Original BMW Harness

By using an original BMW engine harness, you gain:

• factory fitment for the N45 unit in the 3 Series E90 320si model,
• maintained compatibility with the petrol installation and engine control unit,
• consistency with other electrical components of the vehicle,
• easier installation thanks to manufacturer-provided mounting points and wire routing.

This solution is particularly recommended for repairs where parameter repeatability and the possibility of subsequent service according to BMW documentation are crucial.

If you need other components from the category of wires, harnesses, and connectors dedicated to vehicles of this brand, to comprehensively restore the electrical system in your car and maintain the consistency of applied components, check the available parts in the BMW Wires, Harnesses, and Connectors category.

For users interested in selecting used OEM parts by part number or VIN, and comparing solutions used in different powertrains, an article describing the specifics of five-cylinder engines and the practice of component selection may be helpful – more information can be found in the material Audi Five-Cylinder Engine – A Legend from Quattro to RS3 and How to Care for It with Original Audi Parts.